Starting from F9, it starts to crawl with focus and focuses for a long time. A bunch of HA, distortion, smeared edges, vignetting. The focal range of 28-70 is so-so, it would be better if they did 18 - 35 F5 than this, it still lathers wildly at F3.5. I never shoot with this glass at 50 and 70mm, for this any fix will be much better, even the cheapest one. But for the money, how much it costs, this is a good glass to start, or take a picture where you need good quality but the budget is limited. I really don't like the 55mm thread for the filter. It is impossible to find a normal polarizer for such a diameter and it is not needed, because any glass that you buy on the E button accordion does not have a 55mm diameter, everything starts from 65mm.
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